FileGo is a total commander like resource management tool. You can use it to manage files, apps, processes, and remote files.

Two screen UI and drag&drop support, you can imagine what you can do using FileGo. For example: open catalog and choose app manager, then drag something to next screen:you got app backup function!

Blackmoon AttachSave Lite (by Blackmoon Info Tech Services)

A small, on-demand app that will save any Gmail attachment to the SD card and view it from there.
HOW: Preview the attachment in the Gmail app.
Also works with Email app on older phones.
Browse Folder app not included, but not required.
This CANNOT read your email and is forced to guess the attachment name.